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Science & technology

Online seminar: Digitalisation of the waste recycling industry

The online seminar Intelligent Digital Solutions for Waste Recycling is free of charge and registration is now open.

In 2011, the first Hyperspectral Imaging (HSI) camera replaced the point-to-point scanners previously used as standard in the Steinert UniSort PR, paving the way for data-based sorting solutions. This camera has a spatial and spectral resolution of 28,000,000 pixels, a 5,000-fold improvement, and forms the basis of SSteinert’s networked solutions, providing new opportunities in the fight against the scarcity of resources. With the accumulated experience from four UniSort generations, a system was developed to fully process this data. All the necessary components are built into the machines of the EVO 5.0 generation and customers benefit from these advantages:

  • A much shorter commissioning time
  • Easier monitoring of the sorting facility
  • A mobile condition monitoring system that shortens response times in the event of malfunctions
  • AI (Artificial Intelligence) that helps sort previously inseparable materials
  • Remote-controlled deployment of improvements without personnel on site
  • A robot-based quality control
Online seminar: Intelligent Digital Solutions for Waste Recycling

On 26 February 2021, Hendrik Beel, Managing Director of Steinert UniSort, will be explaining this topic in an online seminar. Using practical examples, he will demonstrate how Steinert has developed solutions for highly efficient sorting facilities together with its customers. The seminar will take place at 09:00 CET in English and at 11:00 CET in German. You can register here.

Web application: Digital Solutions available at any time

In the meantime, people interested can also get information via a web application. At www.steinertglobal.com/intelligent-digital-solutions-for-waste/, the six solutions are available in a graphically prepared form.

Cuts commissioning times while also offering optimised staff management and enabling the commissioning of sorting facilities with more than 50 near-infrared (NIR) sorters. By calibrating machines using a central spectral database, the entire system is adapted to the local circumstances at all times and is stable in the face of environmental factors.
Permanently and centrally monitors sorting facilities, enabling incidents to be detected early on to cut downtimes and improve system performance.
Cuts the time it takes to respond to problems thanks to mobile status monitoring and opportunities for service experts to intervene. This ensures a flexible response and improves the reliability of the entire system’s performance.
AI-supported sorting program for sorting materials that could not previously be separated and for solving complicated sorting tasks. This simultaneously guarantees more constant and improved sorting performance.
Allows improvements or totally new functions to be deployed remotely and equips sorting facilities for future requirements without staff having to be present on site.
Robot-based quality check for automated assessment and checking of material qualities for processing, using for example UniSort Unibot. This enables accurate and flexible pricing as well as a response to legal or customer-specific requirements.

Laser-based sensor technology for recycling metals

There are clear advantages of recycling: Used metal scrap that can no longer be used, such as pipes, sheet metal, tools, old cables, electrical and electronic scrap and old parts from households or demolition, can be melted down, sorted by metal or alloy, and reused with virtually no loss of quality. Due to the high value of the materials, the process ideally pays for itself – and produces significantly less CO2 than the primary process: The expensive, technically complex extraction of mineral resources under sometimes highly critical conditions, as well as their transport to destinations around the globe, is no longer necessary.

The crux of the matter is that both the price and availability of metal scrap and its recycling rate depend on numerous mutually dependent factors. These include fluctuating prices on the primary market, the life cycle of products and their collection rate, losses in the process, technical recyclability and the value of the alloy in question. The global markets are correspondingly volatile. If the price of primary metals rises, the availability of scrap falls, and vice versa. This entails high risks for companies.

Greater yield thanks to lasers

Against this backdrop, the Fraunhofer Institute for Laser Technology (Fraunhofer ILT), together with Cronimet Ferroleg from Karlsruhe, Germany, has developed a novel laser-based sorting process. The sensor technology, developed as part of the PLUS project funded by the German Federal Ministry of Education and Research (BMBF), makes the detection and sorting of alloys in metal scrap much faster and more accurate. In 2020, the pilot plant was put into operation at the Cronimet-Ferroleg site in Karlsruhe and has performed remarkably well. Among other things, it is designed to process high-speed steels, or HSS for short.

“HSS tools contain valuable alloying elements such as cobalt and can be found in any hardware store. For example, in drills or milling heads,” says Dr. Cord Fricke-Begemann, who is responsible for materials analysis at Fraunhofer ILT and led the PLUS project with the support of PhD student Fredrik Schreckenberg.

Common processes are limited to the laborious manual measurement of a few alloys. On the other hand, laser-induced breakdown spectroscopy (LIBS), developed at Fraunhofer ILT and used in PLUS, is a technology that can identify more than 20 special alloys even in small scrap parts – automatically, quickly and without contact. “In a very short amount of time, we can process more scrap and achieve higher grade purity,” says Fricke-Begemann. “In this way, we are building an important bridge between research and industry.”

Future technology for Europe

As part of the EU project “Retrofitting Equipment for Efficient Use of Variable Feedstock in Metal Making Processes” (REVaMP), which was launched in 2020, Fraunhofer ILT is now contributing its expertise in the field of material analysis at the European level. The project, which is scheduled to run for three and a half years, is supported by an international alliance of companies and research institutes from Spain, Poland and Germany. “The goal is to put the knowledge gathered in the PLUS project on a universal basis, regardless of the alloys involved,” says Fricke-Begemann. “We want to build a sensor that can be installed in existing industrial plants to make the recycling process fundamentally more efficient.”

What are the composition and properties of the alloys to be recycled? How much lead does the delivered material contain? When does a material become molten and how much energy needs to be added? These questions are the focus of REVaMP and are to be answered more precisely in the future. If successful, this would be a significant contribution to making Europe more independent of the global raw materials markets – and to decisively improving the resource efficiency of its companies.

New tool to measure Zero Waste Status

The Zerowasteometer quantifies an organisation’s various forms of waste management as either a positive figure (associated with reuse and recycling processes) or a negative (landfill and incineration/energy from waste). Their performance is then displayed on an easy-to-understand tachometer and dashboard. The objective is to support companies in working towards the Zero Waste International Alliance’s target of more than 90% of all discarded resources to be diverted from landfill and incineration.

As the tool is normalised and uses the same indices irrespective of volume, users can input and aggregate data for multiple sites and better understand performance over their entire estate. In doing so, they can identify areas of opportunity or poor performance and develop a clear roadmap with measurement points to ensure progress.

This approach supports the legal requirements for environmental reporting that came into effect on 1st April 2019 under Streamlined Energy and Carbon Reporting (SECR), and supports recommendations made by The Taskforce for Climate and Financial Disclosure (TCFD). For qualifying organisations, the obligations require them to measure their waste so that it can be reduced and managed more sustainably in line with reducing carbon emissions. This means using the Waste Hierarchy to measure types of wastes, volumes being produced, their disposal routes and end destinations.

The Zerowasteometer also provides users with a projection on their current climate change impact, with actions and a proposed trajectory indication based on the figures entered. If all waste is recycled, this results in a +1°C trajectory and conversely, if everything is either burnt or buried a +3°C path is observed. Middle of the road performance is regarded as between 2 and 2.5 degrees. Access to this information and a broader climate change context can play an important role in elevating strategic discussions relating to waste, circular economy principles and resources up the corporate agenda.

In addition to the obvious environmental benefits, improved resource efficiency is also proven to realise a significant financial gain with potential cost savings that can equate to 1% of turnover through proven waste minimisation initiatives.

The Reconomy Zerowasteometer is available free to use on the Reconomy website. Once users have input their data, a report will be available detailing some specific performance improvement recommendations for their organisation. This is the first step on the journey towards Net Zero by 2050.

AMI predicts positive future for chemical recycling

In the last thirty years, palletisation films have been one of the success stories of the global plastics and packaging industry. Strong demand from a wide range of customer industries, combined with a real competitive advantage against other forms of pallet stabilisation, has resulted in sustained growth in the developed, more mature markets and accelerating growth in other regions.

The 2020 edition of AMI’s Palletisation Films – The global market report is the result of an extensive research programme, providing a detailed independent assessment of this industry in times of uncertainty as a direct result of the Covid-19 pandemic. The report quantifies demand and production of pallet stretch wrap, shrink hoods and stretch hoods in each world region with a five-year forecast. It examines polymer demand and inter-material competition as well as the industry structure and latest developments of major global palletisation film producers.

The market has matured in Western Europe and North America (USA in particular), resulting in lower growth rates and a strong focus on customised technical innovation. Higher growth rates are projected for the markets of Asia & Australasia, Africa, and even Central & South America despite the economic struggle the key countries like Argentina and Brazil have been enduring. These promising growth rates mean great opportunities to all industry players in these regions. What is required are robust and sustainable strategies to exploit the growing market potential.

Most recently, the dynamics characterising the pallet stretch wrap trade arena have been influenced by a boost in polymer production capacity in the United States, a surge in local consumption in developing nations driven by investments in the retail, infrastructure and construction sectors, as well as fluctuations in exchange rates which have been affecting the competitiveness and cost structures of some regions.

The adoption of stretch hoods is becoming increasingly attractive for a wider range of transported goods at the expense of shrink hoods. As the cost of wrapping machinery decreases because of higher competition from new entrants, and the wrap cost per pallet reduces as a result of thinner and stronger films, it is expected that stretch hoods will continue penetrating more than the spiral pallet wrap applications used by major customers.

Order the report

New TANA 440 Serie shredders

The versatility, productivity and ease-of-use of TANA 440 shredders have all been taken to a new level, following improvements suggested by customers and dealers. The TANA 440 has traditionally been the company’s most popular shredder. It is used especially for processing challenging waste fractions, such as mattresses, tires, plastics, cables and textiles. Versatility was already a major advantage of the TANA shredders, and the new 440DTeco now has even more applications.

The biggest change externally in the TANA 440DTeco shredder is the new higher machine frame, which allows over 200mm more space between the conveyor and the rotor on track models. The new frame structure allows more space for material flow underneath the rotor, helping especially with the pre-shredding of bulky materials, such as plastics and mattresses. Similarly, the new hopper design features a raised wall to prevent unshredded materials from falling onto the discharge conveyor.

In addition to the traditional 33-knife rotor, there is also the new option of 44 knives for added shredding performance. For example, the 44-knife roto increases capacity / output in tire shredding by 25 %. The extended rotor offering also includes options for heavy duty use and for optimizing operating costs. In addition, with the updated labyrinth seal the rotor end structure has improved to protect the gearbox from external objects and disturbances.

The flow of materials through the shredder has been improved in many ways in the new 440 series. This further increase productivity and improve the quality of the end product.

The cleaning combs are now bolted on instead of welded enabling a quicker fix when needed. Different cleaning combs are available for different purposes. Shorter combs are for tougher materials and coarse shredding to ensure the best durability and wear resistance. Longer combs are for easier materials and fine shredding to ensure the best output quality in terms of homogeneous particle size. Bolt-on cleaning combs also make maintenance easier because it is easy to replace damaged ones.

The conveyor system has been completely redesigned. The new structure features two separate conveyors: a transfer conveyor underneath the rotor and a discharge conveyor in the end of the machine. The speed of both conveyors can be adjusted separately. The frame of the discharge conveyor is now self-supporting enabling effortless angle adjustment, even during operation. Also, the scale system calibrates itself automatically depending on the discharge conveyor angle. The optional over-band magnet also features many updates: the magnet has been repositioned higher allowing larger metal piles, the space between the magnet conveyor and the discharge conveyor can be adjusted hydraulically during operation, and the discharge side can be changed.

The new TANA Control System (TCS) features a touchscreen display on the side of the shredder that is used to control all of the machine’s functions safely and in one place. The new user interface is extremely easy to use and helps the operator find the most efficient settings for each process. The new and improved TCS with added sensoring and updated electrical control enables operation to be more efficient and precise. The operating system can be updated remotely and the TANA ProTrack® information management system helps optimize the shredder’s utilization rate and save fuel.

New TANA 440 Serie shredders

The versatility, productivity and ease-of-use of TANA 440 shredders have all been taken to a new level, following improvements suggested by customers and dealers. The TANA 440 has traditionally been the company’s most popular shredder. It is used especially for processing challenging waste fractions, such as mattresses, tires, plastics, cables and textiles. Versatility was already a major advantage of the TANA shredders, and the new 440DTeco now has even more applications.

The biggest change externally in the TANA 440DTeco shredder is the new higher machine frame, which allows over 200mm more space between the conveyor and the rotor on track models. The new frame structure allows more space for material flow underneath the rotor, helping especially with the pre-shredding of bulky materials, such as plastics and mattresses. Similarly, the new hopper design features a raised wall to prevent unshredded materials from falling onto the discharge conveyor.

In addition to the traditional 33-knife rotor, there is also the new option of 44 knives for added shredding performance. For example, the 44-knife roto increases capacity / output in tire shredding by 25 %. The extended rotor offering also includes options for heavy duty use and for optimizing operating costs. In addition, with the updated labyrinth seal the rotor end structure has improved to protect the gearbox from external objects and disturbances.

The flow of materials through the shredder has been improved in many ways in the new 440 series. This further increase productivity and improve the quality of the end product.

The cleaning combs are now bolted on instead of welded enabling a quicker fix when needed. Different cleaning combs are available for different purposes. Shorter combs are for tougher materials and coarse shredding to ensure the best durability and wear resistance. Longer combs are for easier materials and fine shredding to ensure the best output quality in terms of homogeneous particle size. Bolt-on cleaning combs also make maintenance easier because it is easy to replace damaged ones.

The conveyor system has been completely redesigned. The new structure features two separate conveyors: a transfer conveyor underneath the rotor and a discharge conveyor in the end of the machine. The speed of both conveyors can be adjusted separately. The frame of the discharge conveyor is now self-supporting enabling effortless angle adjustment, even during operation. Also, the scale system calibrates itself automatically depending on the discharge conveyor angle. The optional over-band magnet also features many updates: the magnet has been repositioned higher allowing larger metal piles, the space between the magnet conveyor and the discharge conveyor can be adjusted hydraulically during operation, and the discharge side can be changed.

The new TANA Control System (TCS) features a touchscreen display on the side of the shredder that is used to control all of the machine’s functions safely and in one place. The new user interface is extremely easy to use and helps the operator find the most efficient settings for each process. The new and improved TCS with added sensoring and updated electrical control enables operation to be more efficient and precise. The operating system can be updated remotely and the TANA ProTrack® information management system helps optimize the shredder’s utilization rate and save fuel.

Converting old packaging to new

The family business, with over 100 years of combined experience, offers a huge range of quality products, from bulbs to brake pads, and wiper blades to wheel nuts – all sourced from various suppliers.

In their time of trading, they have built a successful business selling everything for the modern day motorist, including garage essentials such as oils and tools to large camping and caravanning equipment – all of which need to be correctly packaged for home delivery.

For some time, MotorNuts had been purchasing their packaging materials prior to sending ordered goods out to customers. As part of the process, the packaging team at MotorNuts would then add shredded paper to fill and pad out their customers’ parcels to further protect the goods during the delivery stage. However, this was proving costly, messy and wasn’t a sustainable solution.

With stock arriving regularly from their network of manufacturers and suppliers, MotorNuts also had a large excess of cardboard packaging being shipped in from their inbound deliveries. With this, MotorNuts had an opportunity to use this cardboard packaging as an alternative to the plastic packaging, such as bubble wrap, and the shredded paper that they were using to protect the goods being delivered to customers.

“We quickly recognised that we could improve our packaging process by seeking a cost-effective alternative to the plastic and shredded paper we were rebuying on a regular basis.“ – Simon Mallard of MotorNuts Ltd.

To make this work, MotorNuts were recommended an HSM ProfiPack packaging solution – an innovative cardboard perforator that perforates used or spare cardboard offcuts. When fed into ProfiPack P425, the offcuts are corrugated in a single step, transforming them into universally applicable padding mats or compressed filling material that secures heavy or difficult-to-pack items. The machine itself is mounted on castors – and with an efficient drive motor that enables continuous operation – it gives users a mobile packaging solution that can be used anywhere and at any time.

MotorNuts quickly realised this would be the perfect solution for their organisation. With cardboard proving to be just as effective as plastic-based alternatives in protecting items in transit, it could be rolled to create void filling to eliminate the movement of products throughout the transport and delivery process.

By implementing this new solution into their process, the online retailer could immediately recycle and reuse their existing cardboard waste, converting used offcuts into sustainable packaging material for new customer orders.

Aside from reducing their cardboard footprint and saving on cardboard disposal costs, the ProfiPack packaging machine would also go on to provide an added financial benefit by recuperating packaging costs that would otherwise be spent on new material.

Mark Harper, Head of OT sales at HSM UK commented, “The ProfiPack P425 is an excellent machine, one that almost any retailer can use to drastically change their environmental footprint for the better. However, the return on investment the machine offers is the main advantage for any user. As MotorNuts have found, you can quickly remove the cost of additional packaging materials by recycling the used materials you already have at your disposal.”

The feedback on the German engineered HSM ProfiPack machine has since been exceptional. With its ease of operation and clear environmental and financial benefits, the transition for MotorNuts (and other retailers) has been smooth.

Simon Mallard of MotorNuts concluded:  “We’d never have imagined just how much the ProfiPack could reinvent our processes for the better. Previously, we spent £80 each month on cardboard collection services – not to mention the costs involved with extra packaging materials such as bubble wrap. The HSM ProfiPack has been a great purchase for our business. It paid for itself within months and has continued to do so ever since.”

With a significant reduction on their carbon footprint and reduced overheads, MotorNuts – with the help of the HSM ProfiPack – continue to supply their customers with essential car parts as a leading online retailer.

Converting old packaging to new

The family business, with over 100 years of combined experience, offers a huge range of quality products, from bulbs to brake pads, and wiper blades to wheel nuts – all sourced from various suppliers.

In their time of trading, they have built a successful business selling everything for the modern day motorist, including garage essentials such as oils and tools to large camping and caravanning equipment – all of which need to be correctly packaged for home delivery.

For some time, MotorNuts had been purchasing their packaging materials prior to sending ordered goods out to customers. As part of the process, the packaging team at MotorNuts would then add shredded paper to fill and pad out their customers’ parcels to further protect the goods during the delivery stage. However, this was proving costly, messy and wasn’t a sustainable solution.

With stock arriving regularly from their network of manufacturers and suppliers, MotorNuts also had a large excess of cardboard packaging being shipped in from their inbound deliveries. With this, MotorNuts had an opportunity to use this cardboard packaging as an alternative to the plastic packaging, such as bubble wrap, and the shredded paper that they were using to protect the goods being delivered to customers.

“We quickly recognised that we could improve our packaging process by seeking a cost-effective alternative to the plastic and shredded paper we were rebuying on a regular basis.“ – Simon Mallard of MotorNuts Ltd.

To make this work, MotorNuts were recommended an HSM ProfiPack packaging solution – an innovative cardboard perforator that perforates used or spare cardboard offcuts. When fed into ProfiPack P425, the offcuts are corrugated in a single step, transforming them into universally applicable padding mats or compressed filling material that secures heavy or difficult-to-pack items. The machine itself is mounted on castors – and with an efficient drive motor that enables continuous operation – it gives users a mobile packaging solution that can be used anywhere and at any time.

MotorNuts quickly realised this would be the perfect solution for their organisation. With cardboard proving to be just as effective as plastic-based alternatives in protecting items in transit, it could be rolled to create void filling to eliminate the movement of products throughout the transport and delivery process.

By implementing this new solution into their process, the online retailer could immediately recycle and reuse their existing cardboard waste, converting used offcuts into sustainable packaging material for new customer orders.

Aside from reducing their cardboard footprint and saving on cardboard disposal costs, the ProfiPack packaging machine would also go on to provide an added financial benefit by recuperating packaging costs that would otherwise be spent on new material.

Mark Harper, Head of OT sales at HSM UK commented, “The ProfiPack P425 is an excellent machine, one that almost any retailer can use to drastically change their environmental footprint for the better. However, the return on investment the machine offers is the main advantage for any user. As MotorNuts have found, you can quickly remove the cost of additional packaging materials by recycling the used materials you already have at your disposal.”

The feedback on the German engineered HSM ProfiPack machine has since been exceptional. With its ease of operation and clear environmental and financial benefits, the transition for MotorNuts (and other retailers) has been smooth.

Simon Mallard of MotorNuts concluded:  “We’d never have imagined just how much the ProfiPack could reinvent our processes for the better. Previously, we spent £80 each month on cardboard collection services – not to mention the costs involved with extra packaging materials such as bubble wrap. The HSM ProfiPack has been a great purchase for our business. It paid for itself within months and has continued to do so ever since.”

With a significant reduction on their carbon footprint and reduced overheads, MotorNuts – with the help of the HSM ProfiPack – continue to supply their customers with essential car parts as a leading online retailer.

Converting old packaging to new

The family business, with over 100 years of combined experience, offers a huge range of quality products, from bulbs to brake pads, and wiper blades to wheel nuts – all sourced from various suppliers.

In their time of trading, they have built a successful business selling everything for the modern day motorist, including garage essentials such as oils and tools to large camping and caravanning equipment – all of which need to be correctly packaged for home delivery.

For some time, MotorNuts had been purchasing their packaging materials prior to sending ordered goods out to customers. As part of the process, the packaging team at MotorNuts would then add shredded paper to fill and pad out their customers’ parcels to further protect the goods during the delivery stage. However, this was proving costly, messy and wasn’t a sustainable solution.

With stock arriving regularly from their network of manufacturers and suppliers, MotorNuts also had a large excess of cardboard packaging being shipped in from their inbound deliveries. With this, MotorNuts had an opportunity to use this cardboard packaging as an alternative to the plastic packaging, such as bubble wrap, and the shredded paper that they were using to protect the goods being delivered to customers.

“We quickly recognised that we could improve our packaging process by seeking a cost-effective alternative to the plastic and shredded paper we were rebuying on a regular basis.“ – Simon Mallard of MotorNuts Ltd.

To make this work, MotorNuts were recommended an HSM ProfiPack packaging solution – an innovative cardboard perforator that perforates used or spare cardboard offcuts. When fed into ProfiPack P425, the offcuts are corrugated in a single step, transforming them into universally applicable padding mats or compressed filling material that secures heavy or difficult-to-pack items. The machine itself is mounted on castors – and with an efficient drive motor that enables continuous operation – it gives users a mobile packaging solution that can be used anywhere and at any time.

MotorNuts quickly realised this would be the perfect solution for their organisation. With cardboard proving to be just as effective as plastic-based alternatives in protecting items in transit, it could be rolled to create void filling to eliminate the movement of products throughout the transport and delivery process.

By implementing this new solution into their process, the online retailer could immediately recycle and reuse their existing cardboard waste, converting used offcuts into sustainable packaging material for new customer orders.

Aside from reducing their cardboard footprint and saving on cardboard disposal costs, the ProfiPack packaging machine would also go on to provide an added financial benefit by recuperating packaging costs that would otherwise be spent on new material.

Mark Harper, Head of OT sales at HSM UK commented, “The ProfiPack P425 is an excellent machine, one that almost any retailer can use to drastically change their environmental footprint for the better. However, the return on investment the machine offers is the main advantage for any user. As MotorNuts have found, you can quickly remove the cost of additional packaging materials by recycling the used materials you already have at your disposal.”

The feedback on the German engineered HSM ProfiPack machine has since been exceptional. With its ease of operation and clear environmental and financial benefits, the transition for MotorNuts (and other retailers) has been smooth.

Simon Mallard of MotorNuts concluded:  “We’d never have imagined just how much the ProfiPack could reinvent our processes for the better. Previously, we spent £80 each month on cardboard collection services – not to mention the costs involved with extra packaging materials such as bubble wrap. The HSM ProfiPack has been a great purchase for our business. It paid for itself within months and has continued to do so ever since.”

With a significant reduction on their carbon footprint and reduced overheads, MotorNuts – with the help of the HSM ProfiPack – continue to supply their customers with essential car parts as a leading online retailer.

Twin-Shaft cutting system ensures precision with maximum efficiency

If it is purely about volume reduction, for example for easier transport, this can be achieved with conventionally designed shafts. Some applications, however, require specific particle sizes for their processes. Plants that recover energy from waste wood, for example, are usually designed with a standardised particle size in mind. Oversized particles in the material stream can block the conveyors or safety systems such as rotary valves. In addition, too many fines negatively affect combustion and very small particles might lead to lumps jamming the facility. Therefore, if the required size is not obtained in the first shredding step, the material must be treated further. The crux of the matter is that additional processing is costly, reduces the recycler’s profit margins and, in the worst case, leads to customer complaints. To avoid these problems, Lindner’s patented SF synchronous fine cutting system is specifically designed based on the following two simple principles.

Scissors and Archimedes’ Screw
The sophisticated geometry of the cutting edges uses the Archimedes’ screw principle to ensure an aggressive material intake. Photo: Lindner Recyclingtech

The easiest way to achieve smaller particles sizes would be to reduce the gap between the individual cutting tools. Conventional shaft pairs crush the material with rippers acting in parallel. If, in this case, the effective working range were extended, the amount of force required and thus the energy consumption would increase significantly. However, if the angle between the knives is changed, they act just like scissors, effectively applying force to a much smaller area. This massively increases the individual tools’ impact while maintaining the same energy consumption. Thanks to the ingenious arrangement of the knives, rippers and small blocks on Lindner’s SF cutting unit, the material is shredded up to four times in one pass. This results in smaller particles with a low percentage of fines. Since less force is needed, the shafts are subject to less stress, which in turn reduces maintenance and increases the cutting unit’s service life tremendously.

If we now look closely at the entire shaft, we see that the cutting edges are not aligned in parallel. Thanks to this arrangement the two shafts act just like two Archimedean screws rotating in opposite directions. What the ancient Greeks used to transport water over great heights with the help of gravity, positively affects the way the shredding unit pulls in the material. This aggressive intake increases the throughput enormously and also mixes the final fraction once again for an output that is as homogeneous as possible.

What needed to be proven

Past experiences show that, with just one single pass, Lindner’s shredders from the Urraco or Miura series equipped with these tools produce a standardised P100 particle size according to ISO 17225-1 with less than 4% fines during waste wood shredding. This standard basically describes in detail the percentages to be achieved as well as maximum specifications for the main fraction, oversized particles and fines (see Table 1). During the production of these standardised particles, depending on the configuration, Lindner’s extremely efficient twin-shaft shredders achieve 20 up to 120 metric tons per hour – an incredible result.

Class main fraction max. coase fraction max. length fine fraction
P63 F05 60% < 63 mm 10% > 100 mm 350 mm < 5% < 3,15 mm
P100 F05 60% < 100 mm 10% > 150 mm 350 mm < 5% < 3,15 mm
P200 F05 60% < 200 mm 10% > 250 mm 400 mm < 5% < 3,15 mm

Typical particle sizes in Line with EN ISO 17225-1


Particle size analysis of A1 to A3 grade, P100 waste wood (in accordance with the German waste wood classification) shredded by Lindner’s Miura 1500 with synchronous fine cutting system. Photo: Lindner Recyclingtech